polyborosilazanes as precursors for si b c n ceramics
polycyclic polyamides as precursors for energetic polycyclic polynitramine oxidizers, method for making new - us patent 6147209
Ngày tải lên: 09/05/2014, 17:02
HỒ SƠ MỜI THẦU CÔNG TRÌNH: KHU NHÀ Ở VÀ CƠ SỞ DỊCH VỤ CHO C.B.C.N.V NHÀ MÁY LỌC DẦU DUNG QUẤT HẠNG MỤC: NHÀ CHUNG CƯ 5 TẦNG CT2
... Về nh n l c: C đủ l c lượng kỹ sư xây dựng c ng trình c ng nh n b c cao đảm nh n c ng vi c theo sơ đồ tổ ch c thi c ng C thể c 02 kỹ sư chuy n ngành xây dựng d n dụng c ng nghiệp c kinh nghiệm ... C ng Chi phí NC (theo c p b c thợ b nh qu n) VL c ng NC Chi phí MTC M.1 ca M.2 ca C ng HẠNG M C: NHÀ CHUNG C TẦNG CT2 M TRANG 40 Hồ sơ mời thầu Dung Quất C ng trình: Khu nhà DV cho C .B. C. N. V ... lượng với đ n giá; - N u n i dung c đi n đ n giá thành ti n b trống số lượng số lượng b trống x c định b sung c ch chia thành ti n cho đ n giá n i dung Trường hợp số lượng x c định b sung n u...
Ngày tải lên: 20/05/2015, 16:32
Alpha fluorinated aromatic ketone as nucleophile in asymmetric organocatalytic c n and c c bonds formation reactions 2
... model H/D exchange reaction catalyzed by the chiral bicyclic guanidine catalyst 25 The deuterium incorporation was monitored by H NMR and enantioselectivity was checked by chiral HPLC The initial ... exchange reaction Scheme 2.6 Chiral bicyclic guanidine 25 catalyzed asymmetric H/D exchange reaction in different conditions 7-Bromo-2-fluoro-3,4-dihydronaphthalen-1(2H)-one 82a was selected for < /b> ... D Scheme 2.8 Chiral bicyclic guanidine 25 catalyzed asymmetric H/D exchange reaction 36 Chapter Based on the optimized reaction conditions, -fluorinated ketones 82a-82h and 82l were chosen as...
Ngày tải lên: 10/09/2015, 15:51
Alpha fluorinated aromatic ketone as nucleophile in asymmetric organocatalytic c n and c c bonds formation reactions 4
... Enatioselective C- N bond formation 3.1 Introduction The catalytic, enantioselective, direct C- N bond formation reaction using carbonyl compounds and nitrogen sources, such as < /b> azodicarboxylates, ... guanidinium NH proton in all cases (see, Chapter Figure 1.1) O CO2R F NH N CO2R O F N tBu 108d N H tBu 82d N 25 tBu tBu RO 2C H N N H N N CO2R O H N F N N O N H F tBu tBu I III tBu H N RO 2C N N N ... COOH NCO2tBu OEt COOEt NHCO2tBu 114 113 decomposition products Scheme 3.10 Dehydrofluorination of 109 under acidic conditions F H CO2Et N( CO2Bn)2 CF3CO2D CDCl3 F H COOH N( CO2Bn)2 O TMSI F CDCl3...
Ngày tải lên: 10/09/2015, 15:51
Alpha fluorinated aromatic ketone as nucleophile in asymmetric organocatalytic c n and c c bonds formation reactions 4a
... Enatioselective C- C bond formation 4.1 Introduction Asymmetric C- C bond formation reactions are important reactions in organic synthesis Among the various asymmetric organic reaction, asymmetric ... TLC bMonitored by 1H NMR c Chiral HPLC analysis We examined this reaction by using chiral bicyclic guanidine And it was 76 Chapter proven to be a good catalyst for < /b> the asymmetric Mannich reaction ... the incomplete reactions Fluorinated quaternary carbon centers, which is one of the most challenging tasks in organic synthesis, were achieved by the asymmetric C- C bond formation reactions of...
Ngày tải lên: 10/09/2015, 15:51
Alpha fluorinated aromatic ketone as nucleophile in asymmetric organocatalytic c n and c c bonds formation reactions 5
... product was filtered by suction on a Buchner funnel and washed by cold acetone for < /b> three times Yellow solid 15 6b was obtained with 86% yield and used for < /b> next step In a 50 mL RBF was placed 15 6b ... 124.3 min; minor isomer: 132.8 5.4 Protocol for < /b> bicyclic guanidine catalyzed asymmetric C- N bond formation reaction and characterization of products 2-Fluoro-3,4-dihydronaphthalen-1(2H)-one 82d ... 5.3 Protocol for < /b> bicyclic guanidine catalyzed asymmetric H/D 107 Experimental exchange reaction and characterization of deuterated products tBu O Br F N tBu N N H 25 (30 mol%) O F D Br D2O (150...
Ngày tải lên: 10/09/2015, 15:51
Alpha fluorinated aromatic ketone as nucleophile in asymmetric organocatalytic c n and c c bonds formation reactions
... reported under much stronger basic phase-transfer conditions We will describe the asymmetric H/D exchange reaction, C- N and C- C bonds formation reactions catalyzed by our guanidine catalysts in the ... reaction between FBSM and allylic acetates (47-49), which was conducted in the presence of chiral palladium complex For < /b> the acyclic and cyclic electrophiles, the FBSM nucleophile showed efficient ... approaches employing fluorocarbon compounds as < /b> nucleophile in asymmetric C- C bond forming reactions have been well developed However, most of efforts focus on to the more reactive fluorocarbon nucleophiles...
Ngày tải lên: 10/09/2015, 15:51
Ruthenium carbonyl complexes as homogeneous catalysts for x h activation (x = c, n, o, si
... main groups, transition series, lanthanides and actinides As < /b> organometallic compounds lie at the interface between classical organic and inorganic chemistry, they often exhibit a combination of ... catalysis [6] 2 Chapter Introduction Table 1.1 Elementary organometallic reaction steps Reaction Change in Change in no of oxidation valence state electrons Change in Coordination coordination number ... unique, for < /b> instance, they possesses a blend of ionic and covalent characters and can dissolve in organic solvents Hence, since the development of the first organo-transitionmetallic compound...
Ngày tải lên: 09/09/2015, 18:57
Chương 4 QU N TR CHI N LƯ CPhân tích ngu n l cn ib doanh nghi pTi n sĩ Nguy n Văn S.nM c tiêu nghiên c u1. Phân tích các y u t ngu n l c n i b và tác ñ ng c a chúng ñ n chu i giá tr . 2. Tìm hi u cách th c ki m soát ngu n l c n i b c a doanh nghi p pot
... N i dung b n Khái ni m ngu n l c n i b C c y u t ngu n l c n i b T c ñ ng c a ngu n l c n i b ñ n vi c hình thành chu i giá tr Ki m soát ñánh giá t c ñ ng c a ngu n l c n i b 4-3 Khái ni ... lu n Ngu n l c n i b s quy t ñ nh kh c nh tranh m c sinh l i c a m t doanh nghi p Ki m soát ch t ch ñánh giá ñúng t c ñ ng c a ngu n l c n i b s ph c v t t cho c ng t c qu n tr chi n lư c C n ... c b n v ngu n l c n i b c a m t c ng ty Ngu n l c n i b bao g m: Tài nguy n nh n l c; Tài s n h u hình vô hình Kh t ch c khai th c ngu n l c C n ph i k t h p s d ng ngu n l c thuê (Outsourcing)...
Ngày tải lên: 06/03/2014, 16:20
tóm tắt luận án cu based organic frameworks as catalysts for c c and c n coupling reactions (tiếng anh)
... studies of Cu3 (BTC)2 , Cu2 (BDC)2 (DABCO), Cu2 (BPDC)2 (BPY) on C C coupling reactions between amine compounds and terminal alkynes, catalytic studies of Cu(BDC) on C N coupling reaction between α-hydroxyacetophenone ... and nitrogen physisorption measurements CHAPTER CATALYTIC STUDIES OF Cu3 (BTC)2 , Cu2 (BDC)2 (DABCO), Cu2 (BPDC)2 (BPY), Cu(BDC) ON C C AND C N COUPLING REACTIONS 3.1 Introduction Cu3 (BTC)2 ... α-hydroxyacetophenone and ophenylenediamine CHAPTER SYNTHESIS AND CHARACTERIZATION OF Cu3 (BTC)2 , Cu2 (BDC)2(DABCO), Cu2 (BPDC)2 (BPY), Cu(BDC) 2.1 Introduction In this chapter, the synthesis, characterization...
Ngày tải lên: 18/06/2015, 17:07
Bác sĩ Chim - chuyện kể
... Những chim nhỏ định mở b nh vi n chữa b nh từ thi n cho vật C c b c sĩ chim m c áo đồng ph c trắng chờ b nh nh n đ n C Chim Chào Mào giao nhiệm vụ tiếp b nh nh n Sáng sớm, b nh nh n Trâu ... chịu Chim B t Ve thấy c nhiều n p nh n gấp da Tê Gi c, n n b b chui vào c n B t Ve n i với Tê Gi c: - B t kể l c b quấy rối b n, b n đ n tìm b n tắm rửa nhé! Tê Gi c nghe lời b c sĩ Chim B t ... khó chịu B c sĩ C nhảy l n lưng Trâu tìm ruồi đốt Trâu C mổ hết ruồi cho Trâu d n: - B c n n thường xuy n xuống sông tắm, phủ b n l n người B ng c ch b c tránh ruồi c n Trâu khỏi ngứa, c m ơn...
Ngày tải lên: 30/09/2013, 07:10
Investigation of au and in as solvents for the growth of silicon nanowires on si(1 1 1)
... not get any nanowires after flooding the chamber with diluted silane and explained the absence of nanowires by considering the surface tension of indium and the low solubility of silicon in indium ... distribution of gold and indium droplets on the silicon surface that we observed by SEM and TEM after cooling down (Figs 1–3) may be therefore reasonably explained considering the influence of solubilities ... indium on Si(< /b> 1 1) has been described and analyzed An explanation based on differences of solubilities of surface atoms in gold and indium and on the different surface energies of the bare and oxidized...
Ngày tải lên: 16/03/2014, 15:17
Báo cáo " Using the reduced La(Co,Cu)O3 nanoperovskites as catalyst precursors for CO hydrogenation " potx
... and O2-TPD (Figs 2-3) In contrast, the presence of extra-lattice copper has an insignificant effect on the activity of cobalt in the dissociation of CO because of both copper and cobalt in such ... ph n b b t ñ i x ng CO C c m u x c t c có c u hình t h t nano c di n tích b m t riêng l n Kh hóa h c b ng hiñro thu ñư c Co, Cu kim lo i ph n t n t t ch t mang La2O3 Pha Co-Cu kim l ñư c s d ng ... is observed that the activity in CO hydrogenation increases with increasing copper content to x = 0.3 The conversion on sample LaCo0.5Cu0.5O3 is very close to that on the blend of Cu2O and LaCoO3,...
Ngày tải lên: 22/03/2014, 09:20
TRƯ NGI H C C N THƠKHOA TH Y S NNGUY N TH DI M THÚYB O QU N CÁ TRA PHILÊ B NG CÁCH R A TRONG DUNG D CH ACID LACTIC VÀ Ư P TRONG NƯ C ÁLU N VĂN T T NGHI PIH CNGÀNH CH BI N TH Y S N2009.TRƯ NGI H C C N THƠKHOA TH Y S NNGUY N TH DI M pptx
... th c l n u t 2,5 ÷ 3kg/con C tra quan sinh d c ph c (sinh d c th c c p) n n n u ch nh n hình dáng b n thí khó ph n bi t c cá c, c th i kỳ thành th c, n sinh d c cá c phát tri n g i bu ng tinh ... tr ng….protein s a ông c l i nh acid lactic Acid lactic c sinh ho t ng Calcium lactate – mu i hòa tan c a acid lactic c s d ng ngu n b sung canxi n kiêng Acid lactic thương m i c s d ng dư c ... 5 0C) b/ Chu n b thí nghi m Chu Chu Chu Chu nb nb nb nb m u c tra philê dung d ch acid lactic n ng n c môi trư ng môi trư ng nuôi c y 24 kh c c/ K t qu thu nh n S d ng thi t b phương pháp x c nh...
Ngày tải lên: 25/03/2014, 04:21
b. much twice c. twice as much d. times two c 35. I’ll always remember that journey - it was an pot
... a b cone c pond d bond b nonsense c cent d bend b lunar c bullet d lotus b clothe c close d pose b sound c soul d cloud b version c pension d tension II Find the mistake: I won’t permit nobody ... a 15 He (not be) here since Christmas; I wonder where he (live) since then a hasn’t been / has been living b hasn’t been / has he been living c hasn’t been / has lived d hasn’t been / lives ... problem of unemployment a hadn’t concerned b haven’t concerned c didn’t concern d wasn’t concerning >a 46 Many famous automobiles in America a manufacture b have manufactured c are manufactured...
Ngày tải lên: 18/06/2014, 17:20
SOLVABILITY CONDITIONS FOR SOME DIFFERENCE OPERATORS N. C. APREUTESEI AND V. A. VOLPERT Received 24 docx
... construct a convergent subsequence Since un = sup j ∈Z |un | ≤ c, then for < /b> every positive integer N, there exists a j subsequence {unk } of {un } and an element u = {u j }N= N ∈ E such that j sup N ≤ ... follows as < /b> above that Im L is closed If not, then we repeat the above reasoning for < /b> zn = y n / y n and g n = f n / y n Passing to the limit on a subsequence nk (such that znk → z0 ) in the equality ... is closed We analyze now the case when {un } is unbounded in E Then we write un = xn + y n with {xn } ∈ kerL and { y n } is in the supplement of kerL Then Ly n = f n If { y n } is bounded in...
Ngày tải lên: 23/06/2014, 00:20
B¸o c¸o c«ng t¸c n÷ c«ng
... -Tổ n c ng cha gây dựng đ c quỹ, Tr n số t n c n b n b c thảo lu n để tìm bi n pháp kh c ph c. Từ nhng sở mà tổ n c ng đề m c tiêu,nhiệm vụ,bi n pháp cho n m h c 2008-2009 B. Phơng hớng ,nhiệm ... phơng hớng vàbi n pháp th c hi n năm h c II.phơng hớng nhiệm vụ tổ n c ng n m h c 2008-2009 Hải - C n vào phơng hớng nhiệm vụ chi trờng h c trờng THCS Di n - C n vào phơng hớng nhiệm vụ trờng n m ... 1.về t tởng - Chị em gơng sáng cho h c sinh noi theo.Ph n đấu tu dỡng phẩm chất đạo đ c ,đ c biệt chi em làm c ng t c GVCNphảI chăm lo r n luyệ dạo đ c h c sinh,nhất h c sinh c biệt - Chị em phải...
Ngày tải lên: 30/06/2014, 16:00
CHUYÊN ð TÍCH PHÂN B ng công th c tích phân b t ñ nh : ∫ 0dx = C n ∫ x dx = ∫ dx = x potx
... Tích ph n lư ng gi c : β D ng : I = ∫ sin mx.cos nxdx α C ch làm: bi n ñ i tích sang t ng β D ng : I = ∫ sin m x cos n x.dx α C ch làm : N u m, n ch n ð t t = tan x N u m ch n n l ð t t = sin ... sin x + d cos x α C ch làm : ð t: a sin x + b cos x B (c cos x − d sin x) = A+ c sin x + d cos x c sin x + d cos x Sau ñó dùng ñ ng nh t th c β D ng 5: I = ∫ α a sin x + b cos x + m dx c sin ... t s ñ c ñi m sau * C n tích ph n , ch n l , tu n ho n , c n + c n dư i, … Chúng ta c n ph i nh nh ng ñ ng th c n y xem b ñ áp d ng B I T P 1 0 Ch ng minh r ng : ∫ x m (1 − x )n dx = ∫ x n (1...
Ngày tải lên: 11/07/2014, 07:20